Increased Surface Fatigue Lives of Spur Gears by Application of a Coating

[+] Author and Article Information
Timothy Krantz

Army Research Laboratory, NASA Glenn Research Center, MS 23-3, 21000 Brookpark Road, Cleveland, OHe-mail: Timothy.L.Krantz@grc.nasa.gov

Clark Cooper

United Technologies Research Center, East Hartford, CT

Dennis Townsend

Townsend Engineering, Westlake, OH

Bruce Hansen

Sikorsky Aircraft, Stratford, CT

J. Mech. Des 126(6), 1047-1054 (Feb 14, 2005) (8 pages) doi:10.1115/1.1799651 History: Received March 20, 2003; Revised February 18, 2004; Online February 14, 2005
Copyright © 2004 by ASME
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Measured dynamic tooth force at nominal test conditions (from Krantz, Ref. 10). The solid line is the measured data, and the dashed lines are replicates of the measured data spaced along the ordinate at the equivalent of one tooth pitch. The zones of double tooth contact (DTC) and single tooth contact (STC) are illustrated.
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Weibull plot of the fatigue test results with best fit lines as was estimated using the maximum likelihood method.
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Typical appearance of failed gear tooth surfaces. (a) Coated gear. (b) Uncoated gear.
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Scanning electron images of a coated and tested gear. (a) Low resolution image showing the contact pattern (slightly darker area) and grinding patterns. The left portion of the image is the fillet and root region, and the tip of the gear is out of the field of view toward the right. (b) Medium-resolution image of the region near the low point of contact on the tooth. (c) High-resolution image from an area of Fig. 6(b) showing the spherical microtopography of the coating and smoothing of an asperity ridge.
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NASA Glenn Research Center gear fatigue test apparatus. (a) Cutaway view. (b) Schematic view.
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Photomicrograph of an etched and polished test gear tooth (from Townsend and Shimski, Ref. 9). (a) Core microstructure. (b) Case microstructure.




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